In the message, read out in French by her daughter, Kiana Rahmani, and posted on the official Nobel website, the 51-year-old activist and journalist expressed "sincere gratitude" to the Norwegian Nobel committee.

Mohammadi -- who was given the nod in early October "for her fight against the oppression of women in Iran" -- once again criticised the requirement for women in Iran to wear a headscarf, and denounced Iranian authorities.

"The compulsory hijab is a means of control and repression imposed on the society and on which the continuation and survival of this authoritarian religious regime depends," she declared through her 17-year-old daughter, who has taken refuge in France along with her family.

She condemned "a regime that has institutionalized deprivation and poverty in society for forty-five years", adding that it was "built on lies, deception, cunning, and intimidation".

Arrested 13 times, sentenced five times to a total of 31 years in prison and 154 lashes, and imprisoned again since 2021, Narges Mohammadi is one of the women spearheading of the "Woman, Life, Freedom" uprising in Iran.

- An 'unstoppable process' -

The movement, which has seen women take off their headdresses, cut their hair and demonstrate in the streets, was sparked by the death of a young 22-year-old Iranian Kurdish woman, Mahsa Amini, last year after she was arrested in Tehran for failing to comply with the strict Islamic dress code.

On Saturday, Armita Garawand, a 17-year-old ethnic Kurd, died a week after she was declared "brain dead," after she had been hospitalised since October 1 after she fell unconscious on the metro.

Rights groups have said the teen was critically wounded during an alleged assault by female members of Iran's morality police. The authorities dispute this account, saying she suddenly fell ill.

"We, the people of Iran, demand democracy, freedom, human rights, and equality, and the Islamic Republic is the main obstacle in the way of realizing these national demands," Mohammadi said in her message.

"We... are struggling to transition away from this religious authoritarian regime through solidarity and drawing on the power of a non-violent and unstoppable process in order to revive the honor and pride of Iran and human dignity and prestige for its people," she continued in the message from the Evin prison.

"Victory is not easy, but it is certain," she concluded.

It was not disclosed how the message was smuggled out.