A student who escaped a jail sentence, despite being caught with more than 100 indecent images of children on his Xbox, had other encoded computer discs suspected of containing more child pornography that could not be cracked by police experts.

Officers found 105 indecent images on the computer console when they raided Adil Khan’s Gleneagle Road home in Streatham in July 2007 after a tip-off from his ex-girlfriend, Inner London Crown Court heard last week.

They also found a “sophisticated computer set-up”, with up to 20 discs so well encrypted police could not decode them.

Khan, 31, who was arrested after the raid on the day he graduated from university, refused to disclose the codes to the discs, the court was told.

Judge Lindsay Burn said: “The reason for the encryption was to keep people out. The police were bound to think there was other sexual material, possibly of children.”

The majority of the images found partially deleted from the console were of the lowest level, but some were of level four, the court heard.

Level four child pornography contains “grossly obscene images of sexual assault”, according to the UK Sentencing Advisory Panel.

Judge Burn said he could only sentence based on the charge Mr Khan had pleaded guilty to.

Prosecutors chose to leave the other charges, including one of obstructing the police investigation by not disclosing the codes, on his file, the court heard.

Yesterday Judge Burn gave Khan a six-month prison sentence, suspended for two years, a two-year supervision order and would put him on the sex offenders register.

He had suspended formal sentencing from the hearing on June 16 until yesterday, while prosecutors drew up a suitable sexual offences prevention order after the one put forward effectively prevented Khan having children.

According to the court, no sexual offences prevention order was imposed yesterday but Khan was put on the sexual offenders register for seven years.

He was also ordered to attend a sexual offenders' group programme.

The court heard on June 16 Mr Khan, who lived at home with his mother, had “suffered greatly” as a result of his actions, which he understood were “reprehensible”.

He was unable to find work or study further because of an order banning him from using the internet and owning a mobile phone.

He was also banned from attending cricket matches by the International Cricket Council (ICC) and shunned by neighbours, the court was told.