She says that Jesus’ burial certificate was glued to the cloth covering him and then the ink was transferred to the cloth:

Dr Barbara Frale, a researcher in the Vatican secret archives, said “I think I have managed to read the burial certificate of Jesus the Nazarene, or Jesus of Nazareth.” She said that she had reconstructed it from fragments of Greek, Hebrew and Latin writing imprinted on the cloth together with the image of the crucified man.
[…]
Dr Frale said that many of the letters were missing, with Jesus for example referred to as “(I)esou(s) Nnazarennos” and only the “iber” of “Tiberiou” surviving. Her reconstruction, however, suggested that the certificate read: “In the year 16 of the reign of the Emperor Tiberius Jesus the Nazarene, taken down in the early evening after having been condemned to death by a Roman judge because he was found guilty by a Hebrew authority, is hereby sent for burial with the obligation of being consigned to his family only after one full year”. It ends “signed by” but the signature has not survived.

The Times Online article states that the Roman authorities would hold the body for a year in a common grave placing a death certificate on the burial cloth for later retrieval. I find it hard to believe that was the custom when dealing with those who had been crucified. I’d read that they either left them to rot on the cross as a deterrent to others or throw their body in their body in the trash. From Antonio Lombatti, a church historian:

He also rejected the idea that authorities would officially return the body of a crucified man to relatives after filling out some paperwork. Victims of that form of execution used by the Romans would usually be left on the cross or were disposed of in a dump to add to its deterrent.

And though she claims that her account is consistent with the Gospels, I don’t think it fits with this:

John19:38 After these things Joseph of Arimathea, who was a disciple of Jesus, but secretly for fear of the Jews, asked Pilate that he might take away the body of Jesus, and Pilate gave him permission. So he came and took away his body. 39 Nicodemus also, who earlier had come to Jesus by night, came bringing a mixture of myrrh and aloes, about seventy-five pounds in weight. 40 So they took the body of Jesus and bound it in linen cloths with the spices, as is the burial custom of the Jews. 41 Now in the place where he was crucified there was a garden, and in the garden a new tomb in which no one had yet been laid. 42 So because of the Jewish day of Preparation, since the tomb was close at hand, they laid Jesus there.

Why would they need a certificate to identify the body when they took it right after his death?